The mitotic stage in which the chromosomes condense, nuclei disappear, and the mitotic spindle begins to form is known as:
A. prophase.
B. metaphase.
C. anaphase.
D. telophase.
E. interphase.
A
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The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids B. carbohydrates C. inorganic compounds D. methane gas and alcohols
Why is it important to include a placebo in a scientific study to assess the effectiveness of a drug?
A. It's actually unethical to do so-if you have a drug that you know to be effective, it's unethical to withhold that treatment from an ill patient. B. A placebo-treated group will determine if the changes observed in the drug-treated illness group are due to a psychological effect rather than a physiologic/pharmacologic one. C. It isn't scientifically important-a placebo simply helps investigators satisfy the legal requirements of the Food and Drug Administration in their testing process. D. A placebo-treated group will determine if the changes observed in the illness in this non-treated group are due to a physiologic/pharmacologic effect rather than a psychological one.
Which of the following structures is NOT actively involved with saltatory conduction?
a. oligodendrocytes b. myelin c. Na+/K+ pumps d. voltage-gated Na+ channels e. nodes of Ranvier
Each spore grows by mitosis into a haploid organism by called a ________
Fill in the blank(s) with the appropriate word(s).